package com.sky.service.impl;

import com.github.pagehelper.Page;
import com.github.pagehelper.PageHelper;
import com.sky.constant.MessageConstant;
import com.sky.constant.StatusConstant;
import com.sky.dto.DishDTO;
import com.sky.dto.DishPageQueryDTO;
import com.sky.entity.Dish;
import com.sky.entity.DishFlavor;
import com.sky.exception.DeletionNotAllowedException;
import com.sky.mapper.DishFlavorMapper;
import com.sky.mapper.DishMapper;
import com.sky.mapper.SetmealDishMapper;
import com.sky.result.PageResult;
import com.sky.service.DishService;
import com.sky.vo.DishVO;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;

import java.util.ArrayList;
import java.util.List;

@Service
@Slf4j
public class DishServiceImpl implements DishService {

    @Autowired
    private DishMapper dishMapper;
    @Autowired
    private DishFlavorMapper dishFlavorMapper;
    @Autowired
    private SetmealDishMapper setmealDishMapper;


    /*新增菜品*/
    @Transactional //0.开启事务（涉及多张表的CRUD操作需要开事务）
    public void addDish(DishDTO dto) {
        //1.构造菜品基本信息，将其存入Dish表中。
        Dish dish = new Dish();
        //拷贝属性值
        BeanUtils.copyProperties(dto,dish);
        //调用mapper保存方法
        dishMapper.insert(dish);
        log.info("dishId={}",dish.getId());
        //2.构造菜品口味列表数据，将其存入dish_flavor表中
        List<DishFlavor> dishFlavorList = dto.getFlavors();
        //2.1补充关联菜品id
        dishFlavorList.forEach(flavor->{
            flavor.setDishId(dish.getId());
        });
        //2.调用mapper保存方法，批量插入口味列表数据
        dishFlavorMapper.insertBatch(dishFlavorList);
    }

    /*分页查询菜品列表*/
    @Override
    public PageResult page(DishPageQueryDTO dto) {
        //1.设置分页参数
        PageHelper.startPage(dto.getPage(),dto.getPageSize());
        //2.调用mapper的列表查询方法 强转成page
        Page<DishVO> page=dishMapper.list(dto);
        //3.封装pageResult对象返回
        return new PageResult(page.getTotal(), page.getResult());
    }

    /*删除菜品*/
    @Transactional//0.开启事务
    public void delete(List<Long> ids) {
        //1.删除菜品之前需要判断需要是否起售 起售中的不允许删除
        ids.forEach(id->{
            Dish dish= dishMapper.selectById(id);
            if(dish.getStatus()== StatusConstant.ENABLE){
                throw new DeletionNotAllowedException(MessageConstant.DISH_ON_SALE);
            }
        });

        //2.需要判断菜品是否被套餐关联，关联的也不能删除
        Integer count = setmealDishMapper.countByDishId(ids);
        if(count>0){
            throw new DeletionNotAllowedException(MessageConstant.DISH_BE_RELATED_BY_SETMEAL);
        }
        //3.删除菜品基本信息dish表
        dishMapper.deleteBatch(ids);
        //4.删除菜品口味列表信息dish_flavor
        dishFlavorMapper.deleteBatch(ids);
    }

    /*根据id查询菜品*/
    @Override
    public DishVO getById(long id) {
        DishVO dishVO=new DishVO();

        //1.根据菜品id查询菜品信息，封装到dishvo
        Dish dish= dishMapper.selectById(id);
        BeanUtils.copyProperties(dish,dishVO);
        //2.根据菜品id查询口味列表数据
        List<DishFlavor> dishFlavorList = dishFlavorMapper.selectByDishId(id);
        dishVO.setFlavors(dishFlavorList);
        //3.构造DishVo对象返回
        return dishVO;
    }

    /*修改菜品*/
    @Transactional//0.开启事务
    public void update(DishDTO dto) {
        Dish dish=new Dish();
        BeanUtils.copyProperties(dto,dish);
        //1.修改菜品的基本信息dish表
        dishMapper.update(dish);
        //2.修改口味列表信息，dish_flavor表
        //由于口味可能增加、删除、还可能修改值，设计增删改操作，所以直接全部删除旧数据，再添加新数据
        dishFlavorMapper.deleteByDishId(dto.getId());

        List<DishFlavor> flavors = dto.getFlavors();
        if(flavors!=null&&flavors.size()>0){
            //关联菜品id
            flavors.forEach(flavor->{
                flavor.setDishId(dish.getId());
            });
            dishFlavorMapper.insertBatch(flavors);
        }

    }

    /**
     * 条件查询菜品和口味
     * @param dish
     * @return
     */
    public List<DishVO> listWithFlavor(Dish dish) {
        List<Dish> dishList = dishMapper.listBy(dish);

        List<DishVO> dishVOList = new ArrayList<>();

        for (Dish d : dishList) {
            DishVO dishVO = new DishVO();
            BeanUtils.copyProperties(d,dishVO);

            //根据菜品id查询对应的口味
            List<DishFlavor> flavors = dishFlavorMapper.selectByDishId(d.getId());

            dishVO.setFlavors(flavors);
            dishVOList.add(dishVO);
        }

        return dishVOList;
    }
}
